Wall Street Journal: Russian invasion of Ukraine "underway."

Masked and armed Russian speakers with the distinct look of special forces, but no military insignias, took over police stations and other locations in much of Ukraine's east over the weekend. 

The Kiev government is mobilizing its military for what it called a "large-scale antiterrorist operation" in the east. "We won't allow Russia to repeat the Crimean scenario in the eastern regions of the country," said acting President Oleksandr Turchynov.

Gun battles in Slovyansk and elsewhere have already produced casualties, and the violence may be exactly what Mr. Putin wants as a pretext to send in larger forces in the name of protecting Russian-speaking minorities.